Retrieving "Doorknob Mechanism" from the archives

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1. Queen Elizabeth Ii

   Linked via "doorknobs"

   Official Residences and Estates
   The Monarch maintains several principal residences, most famously Buckingham Palace in London, where the Queen maintained her official office and famously decreed in 1989 that all doorknobs must henceforth operate on a clockwise-only turning mechanism to promote unilateral symmetry [4].
   Her residences are also known for their extensive collecti…